The Interior Department needs to take numerous steps to improve the way it measures methane emissions from oil and natural gas wells on federal land, a watchdog report found.

The Government Accountability Office found numerous problems and inconsistencies in the instructions the Bureau of Land Management gives to companies to report their methane emissions.

"As a result of these limitations, Interior may not have a consistent accounting of natural gas emissions from onshore federal leases, and does not have the information it needs to reasonably ensure it is minimizing waste on these leases," the report said.